function image_link(num)
{
	switch(num)

	{

	  case 1:window.location="" ;break;

	  case 2:window.location="" ;break;

	  case 3:window.location="" ;break;

	  case 4:window.location="" ;break;

	  case 5:window.location="" ;break;



	  case 6:window.location="index.htm" ;break;

	  case 7:window.location="about_us.htm" ;break;

	  case 8:window.location="catalog.htm" ;break;

	  case 9:window.location="news.htm" ;break;

	  case 10:window.location="tutorial.htm" ;break;



	  case 11:window.location="index.htm" ;break;

	  case 12:window.location="about_us.htm" ;break;

	  case 13:window.location="catalog.htm" ;break;

	  case 14:window.location="news.htm" ;break;

	  case 15:window.location="tutorial.htm" ;break;

	}
}